- 18 -
(Continued)
j.
9 blinks = Fan-limit switch open (only if Hydronic heat or gas heat configured by DIP switch)
– Disables fan in gas heat mode and Hydronic heat mode
k. 10 blinks = Configuration read failure (check setting on configuration switch)
l. 11 blinks = Module mismatch error (happens if boards are mismatched)
2- Standard Electronic Controls
The Diagnostic Maintenance provides detailed information on PTAC control operation and operational status
including present modes, failures, airflow restriction warnings, operating temperatures, and past failures.
To enter Diagnostic Status Report mode, press and hold the down arrows and, while holding, press the FAN SPEED key
for a period of five (5) seconds.
The meaning of figure on display pad is as below: X.X----(0~4: time of protection)
└
━
is protection mode(1: anti-frost; 2: overheat; 3: high pressure; 4: anti-freezing)
Failure code
Content of defect
E2
Indoor temperature sensor failure
E3
Indoor coil temperature sensor failure
E5
Outdoor coil temperature sensor
E8
Failure Overheating protection
/
defrosting
E9
High pressure protection
Summary of Contents for EZ Series 25
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